Electric bell



Aug. 13, 1929.

H.LSHONNARD ELECTR I C BELL Filed March 28, 1928 Patented Aug. 13, 1929.

UNITED STATE v HAROLD W. SHONNARD, OF MONTGLAIR,

SUPPLIES COMPANY, INCL, OF HOBOKEN,

JERSEY.

NEW JERSEY, ASSIGNOR TO ELEVATOR NEW JERSEY, A. CORPORATION OF NEW ELEGTBIC BELL.

Application filed March 28, 1928. Serial No. 265,267.

This invention relates to electric bells of the kind in which the striking mechanism comprises a striker constituted as a movable magnetic element adapted to be directlyjnfluenced by the electro-magnetic element in such a manner that the striking of the bell is effected by momentum of the magnetic element acquired upon excitation of the electromagnetic element, and damping of the bell vibrations or rebound of the striker is prevented by the ,combined action on the striker of gravity and that of the electro-magnetic devlce.

The object of the present invention is to generally improve the construction of such a bell. One of the principal improvements consists in providing a sleeve of novel construction surrounding the reciprocating magnetic coil or plunger which constitutes the striker element.

Specifically it is an object of the present invention to provide such a sleeve having a flared section near its upper end to-serve as a means for restraining the movement of the sleeve in one direction, and hence assist in maintaining the striker element normally'in proper position with respect to the magnetic coil constituting the actuating instrumentality.

It is a further object of the present invention to provide a certain degree of restriction of the upper opening of the sleeve, to an extent which will prevent an escape o the striker element from the said sleeve 5 while at the same time permitting an outward movement of the striker element to an extent suflicient to produce the desired operation.

Other objects and advantages to be derived 40 from the use of the present invention reside in the specific construction and relative disposition of the parts, as will become apparent as the description progresses, reference being had to the accompanying drawings wherein:

Figure 1 is a View in elevation of the bell as it appears in assembled and mounted position; the sounding plate appearing in phantom.

Figure 2 is a vertical sectional view taken on line 2-2, Figure 1.

Referring to the drawings, reference character 1 indicates a mounting plate on which is supported a solenoid 2 by means 'of a bracket or yoke 3 embracing the said solenoid and holding it in place against the mounting board 1 by means of the screw and nut arrangements indicated at 4. This screw and nut also serve to retainthe sounding plate 5 in place, in such a position that the upward travel of the solenoid plunger 6 W111 cause an impact therewith at the point indicated at 7*, thereby sounding the bell. As shown the plunger 6 is provided with an upper portion of reduced diameter as indicated at 7, the purpose for which will presently appear. Also as clearly shown in Figure 1 the plunger is separated from the coil by means of the relatively thin sleeve 8 which extends through the entire length of the coil 2 and protrudes therefrom at the upper end, where it is flared outwardly to form'a retaining shoulder 9. At its uppermost end it is bent inwardly in thimble fashion, as indicated at 10, so as to leave an opening just sufficient to permit the passage therethrough of the upper end 7 of the plunger 6. The plunger 6 and sleeve 8 are retained at their lower ends by the provision of a cap 11 as shown. Binding posts are shown at 13. These serve for the reception of the current conductors (not shown) which are provided for the conduction of current to the coil 2, it being understood that the circuit leading to the binding posts 13 and coil 2 will be provided with suitable circuit makin and breaking means permitting the operation of the bell at will.

With the foregoing description in mind the operation is as follows:

Upon energization of the solenoid 2 by reason of the introduction of an electric current to the windings thereof by way of the conductors leading to the binding posts 13, the magnetic attraction set up will draw the plunger 6 upwardly with considerable force tocause the upper end 7 thereof to strike against the sounding plate 5 at the point indicated at 7. This causes a sounding of the bell. Immediately thereafter continued energization of the solenoid 2 sets up a magnetic force tending to return the plunger 6 to a central position in this magnetic field, which will be substantially the central position in the coil 2. This force, therefore, tends to immediately withdraw the plunger from contact with the sounding plate 7 and therefore prevents any vibration or echoing 'struction herein descri asmuch as it by the to its own weight, return to the position indicated in Fi ure 2.

The PIOVlSlOIl of the flared construction indicated at 9 prevents the sleeve 8 from dropping out of the coil, inde endently of the provision of the cap 11. he provision of the inwardly bent construction indicated at 10 prevents the plunger 6 from passing outwardly any further than is permitted by the length of the portion 7 of reduced diameter. The flared shoulder at'9 furthermore serves to fix the normal location of the striker element 6 relatively to the coil 2 inprevents further tightening of the cap 11 after the latter has been screwed on sufiiciently to bring the shoulder 9 tightly against the upper edge of the easing 3.

am aware that solenoid operated bells of this have been able to determine I am the first to provide a bell of the single impact type having the novel plun er and sleeve coned, together with the other features of novelty defined in the ap ended claim.

he above specification and the annexed general type are old but so far as I.

drawings are to be trative'of what I bodiment at this time. limited to this specific form or to any particular combination or application of the parts, but embraces all modified forms and constructions within the scope of-the appended claim.

I claim:

An electric bell comprising a base plate, a hollow casing secured to said base plate, a coil in said casing, a sleeve extending through said coil and protruding on opposite sides of said casing, one end of said sleeve having its edges bent inwardly, a striker element movable through said sleeve and having a reduced portion forming a shoulder adapted to cooperate with said bent edges on the sleeves whereby the stroke of the striker is positively limited, a sounding plate mounted on the casing and adapted to cooperate with the striker, and means for securing the sleeve'in proper position in said casing comprising an integral shoulder on sald sleevebearing against one end of deem the preferred em- The invention is not [the casing and a cap threaded to the oppoand bearing against the casing, whereby adjustably tightened site end of said sleeve the opposite end of said shoulder may be against said casing.

Signed at Hoboken in the county of Hudson and State of New Jersey this 27th day of March, A. D. 1928.

HAROLD W. SHONNARD.

considered only as illus- 

